Web printing means |
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| 申请号 | US3713420D | 申请日 | 1971-01-21 | 公开(公告)号 | US3713420A | 公开(公告)日 | 1973-01-30 |
| 申请人 | SICKINGER CO H; | 发明人 | PFAFFLE E; | ||||
| 摘要 | Means for printing margin lines on a web of ruled paper to be cut into multiple-leaved sheets, in which a trim allowance is to be provided at the ends of each sheet. The means comprises a margin line printing roll having a plurality of equidistantly spaced ridges. The roll is driven by a gear the teeth of which have a predetermined pitch, except for one section in which there is a larger pitch. The margin lines will be printed at even intervals during the time the roll is driven by the teeth of predetermined pitch, but with the paper moving at a constant speed, a slightly greater interval will occur between margin lines during the time the roll is driven by the tooth section of larger pitch. Thus, the web may later be cut to form sheets each of which has a trim allowance at the outer edges thereof. The sheet is later cut into individual leaves. | ||||||
| 权利要求 | 1. Means for printing margin lines in a web moving at constant speed through a ruling machine such that the web may be cut into sheets having a predetermined number of leaves lengthwise with a trim allowance at opposite ends of the sheet, said means comprising a margin line printing roll rotatable on an axis at right angles to the direction of web movement and having at least one margin line printing ridge on its surface extending parallel To its axis, the number of ridges being less than said predetermined number, and means for rotating said roll at a rate with respect to the rate of movement of said web such that all but one of the gaps between the margin lines on each sheet will be equal to the leaf width and the remaining gap will be slightly greater, thereby providing a trim allowance at opposite edges of the sheet when it is cut from the web. 1. Means for printing margin lines in a web moving at constant speed through a ruling machine such that the web may be cut into sheets having a predetermined number of leaves lengthwise with a trim allowance at opposite ends of the sheet, said means comprising a margin line printing roll rotatable on an axis at right angles to the direction of web movement and having at least one margin line printing ridge on its surface extending parallel To its axis, the number of ridges being less than said predetermined number, and means for rotating said roll at a rate with respect to the rate of movement of said web such that all but one of the gaps between the margin lines on each sheet will be equal to the leaf width and the remaining gap will be slightly greater, thereby providing a trim allowance at opposite edges of the sheet when it is cut from the web. 2. The combination according to claim 1, said last-mentioned means comprising a driven gear connected to said roll and having equidistantly spaced teeth entirely around its periphery, and a driving gear meshing with said driven gear, said driving gear having a first zone of teeth with a pitch equal to that of the driven gear teeth, and a second zone with teeth having a slightly greater pitch, said second zone driving said roll at a slightly slower rate than said first zone, whereby said greater margin line gap will be created. 3. The combination according to claim 2, said sheet having four leaves lengthwise, said roll having two ridges, whereby each ridge prints two margin lines per sheet. 4. The combination according to claim 3, said second zone of teeth occupying approximately one quarter of the driving gear circumference and having one less tooth than each of the other quarter segments on said driving gear. 5. The combination according to claim 2, further provided with a counterpressure roller opposite said margin line roll, a shaft for said margin line roll, said driven gear being fixed to said shaft, a shaft for said counterpressure roller, means driving said counter-pressure roller shaft, a gear on said counterpressure roller shaft, a gear rotatably mounted on said margin line roll shaft and driven by the gear on said counterpressure roller shaft, and a gear fixed to and co-axial with said driving gear and driven by said freely rotatable gear. 6. The combination according to claim 5, both gears on said margin line roll shaft having the same number of teeth with the same pitch, said gear fixed to the driving gear also having teeth with the same pitch around its entire periphery. |
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